HP TopTools for Hubs and Switches - Manual (Page 92)

9-4
Monitoring Network Traffic
Using Traffic Monitor
The six tabs across the top of the histogram display the values for the segments
for the selected segment group, or for the entire network if “All Segments” is
selected in the Segment Groups list box. The Worst Overall tab displays in
sorted order left to right the segments that have the most problems in the
selected segment group. For example, if the histogram displays 10 segments
in red, this indicates that these segments have exceeded at least one of the
thresholds set for them. For one segment that might be the Errors threshold,
for another it might be the Utilization% threshold. Holding the mouse over the
segment bar will display a tool tip with the segment name and the
measurement represented, for example, “Utilization: Shared Segment 001”.
Clicking on the segment bar highlights that segment and displays it in the
Selected Segment list box. If you have checked the “Link gauges to selected
segment in histogram” check box (located in the Options button), the gauges
change to reflect the attribute values for that segment.
Comparing Segments Across Different Medias
The yellow warning threshold line and the red critical threshold line are
displayed across the histogram at the same level for all segments. Because the
actual threshold values for various types of media are different, the segment
bar heights are “normalized” to the threshold lines so that they can be
compared visually. For example, if Segment A is a 10Base-T segment, its
warning threshold for Frames/sec might be 3,000 frames/sec. For Segment B,
a 100Base-T segment, the warning threshold for Frames/sec might be 30,000
frames/sec. In order to make a comparison, the height of the segment bar is a
percentage above a threshold value, for example, 50% over the warning
threshold. Both segments can have the same percentage above the warning
threshold settings even though the actual value of Frames/sec is different for
each segment.
Selecting Segment Groups and Segments
To display the segments for a specific segment group, select the segment group
from the
Segment Groups drop-down list at the bottom of the Traffic Monitor
page. The segments for that subnet will be listed in the Selected Segment list
box.
If you want to see the gauges reflect the values of attributes for a particular
segment, click on
Options and check Link Gauges to selected segment in
histogram.
Setting Thresholds
When you click on Thresholds at the bottom of the Traffic Monitor page, a
separate Thresholds browser window appears. A set of default thresholds is
provided for each network attribute and is specific to a segment and its type.
The values shown for the Ethernet tab are for a media speed of 10 Mbps. If
your Ethernet is 100 Mbps or Gigabit, or if the segments are trunked, the
threshold values are adjusted automatically. The thresholds for other types
are also adjusted automatically when appropriate, for example, if the